# Explain how white blood cells protect the body when a pathogen enters the bloodstream.

> WJEC GCSE Biology (Wales) — 2.6.2 The immune system · Explain · 4 marks

## Mark scheme (4 marks)

1. White blood cells can engulf and digest pathogens (phagocytosis)
2. White blood cells produce antibodies
3. Antibodies are specific to / bind to antigens on the pathogen
4. White blood cells produce antitoxins that neutralise toxins released by pathogens

## Related

- [Revision notes for WJEC GCSE Biology (Wales)](https://www.gradenine.co.uk/learn)
- [How to answer "Explain" questions](https://www.gradenine.co.uk/tools/command-word-cheatsheet)
- [Practice this with AI marking (free)](https://www.gradenine.co.uk/start)

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